/Engine/Source/Runtime/SandboxFile/Public/IPlatformFileSandboxWrapper.h
Checks if this platform file should be used even though it was not asked to be. i.e. pak files exist on disk so we should use a pak file
virtual bool ShouldBeUsed ( [IPlatformFile](API\Runtime\Core\GenericPlatform\IPlatformFile) * Inner, const TCHAR * CmdLine ) const